Fuel octane on hp 273charger engine 10.5:1 compression .

Abodybomber said
Sweet engine! If I am not mistaken,a better exhaust could help lower octane requirements.Gets the spent A/F mixture out faster.On overlap(and inertia at work) bring in a fresh cooler intake charge quicker.Food for thought.

abodybomber ........ I think you may have something there... I just recurved my distributor and installed a pertronix III and flamethrower coil . I got this distributor really dialed in now. I wanted to try 89 octane in the 273hp to see how it liked it and it does not ping at all .. performance is still there overall.
It Rocks !
I do have the best intake out there for the small port 273 heads, the dougs headers , 2.5" pipes and x-pipe with dynomax ultraflows .. Sweet !!!
It all works to it's finest potential ..

:burnout: